Microbiological closure



FIG. 1 is a top plan view of a microbiological closure showing my newdesign;

FIG. 2 is a side elevation thereof;

FIG. 3 is a cross-section taken on line 2--2 of FIG. 2; and

FIG. 4 is a bottom plan view thereof.

The ornamental design for a microbiological closure, as shown.